球磨制备Ti_(0.8)Zr_(0.2)V_(2.7)Mn_(0.5)Cr_(0.7)Ni_(1.75)-15wt%A_2B_7复合储氢材料及其电化学性能研究  

Study on Synthesis of Ti_(0.8)Zr_(0.2)V_(2.7)Mn_(0.5)Cr_(0.7)Ni_(1.75)-15wt%A_2B_7 Type Composite Prepared by Ball Milling and Its Electrochemical Properties

作　　者：刘夏[1] 罗永春[1] 宋宏儒[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2008年第20期40-42,共3页Hot Working Technology

摘　　要：采用球磨和表面改性方法制备了复合储氢材料Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75-15wt%La1.5Mg0.5Ni6.7Al0.3。研究和分析表明,钒基Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.7铸态合金由bcc结构固溶体相和六方晶系C14型Laves相构成三维网状组织,球磨改性后钒基合金与La1.5Mg0.5Ni6.7Al0.3之间并未发生合金化反应。电化学性能研究表明,经球磨改性后复合材料Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75-15wt%La1.5Mg0.5Ni6.7Al0.3能明显增加合金的电极放电容量。铸态钒基合金和球磨复合材料均具有良好的电化学循环稳定性,其中球磨1h后电极最大放电容量为300.1mA/g,经100次循环后的电化学容量保持率为97.2%,球磨5h后试样的循环稳定性高达99%。Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75-15wt%La1.5Mg0.5Ni6.7Al0.3. composite were prepared by mechanical ball- milling . The effects of ball-milling on electrochemical properties of the mixed alloys were studied at 0.5-1 h. The results show that V based ingot Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75 are composed of a solid solution phase with bcc structure and a C14-type Laves secondary phase with hexagonal structure in the form of three dimensional network microstructure. Compared with ingot alloy Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75, in the milled modification composite, Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75 particles do not take place chemical reaction with La1.5Mg0.5Ni6.3Al0.3 Electrochemical properties measurement shows that discharge capacity of the milled composite is significantly improved. The V based ingot and milled composite have excellent cycle-life. The maximum discharge capacity of the composite milled for 1 h is 300.l mA/g, and keeps about 97.2% electrochemical capacity after enduring 100 cycle number. The cycle-life of composite milled for 5 h is 99%.

关 键 词：机械球磨 球磨制备Ti0.8Zr0.2V2.7Mn0.5Cr0.7Ni1.75-15wt%Mg0.5Ni6.7Al0.3合金 储氢 改性 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG146.4[金属学及工艺—合金]